Question

When work is done on system or by a system there is a change in _________

(a) external energy

(b) internal energy

(c) adiabatic energy

(d) isothermal energy

The question was asked in final exam.

My query is from Thermodynamic Terms in section Thermodynamics of Chemistry – Class 11

Answer 1

Correct answer is (b) internal energy

To explain: When a work is done or by the system, heat passes into out of the system and matter enters or leaves the system, there is a change in internal energy of the system. It is represented by the symbol “U”.